Circuit/System Verification

Ignition ON.
Verify that no ignition, starter relay, brake pedal position sensor, immobilizer, or automatic transmission DTCs are set that would cause the K20 Engine Control Module to disable engine starting.
- If DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no DTCs are set
Verify the scan tool BCM 5 V Ignition Switch parameter is Crank Request when the ignition switch is in the crank position.
- If Crank Request not displayed
  Refer to Power Mode Mismatch .
Verify the scan tool TCM Internal Mode Switch parameter displays Park with the transmission range selector in park.
- If the TCM Internal Mode Switch parameter does not indicate Park
  Refer to Transmission Internal Mode Switch Logic
- If the TCM Internal Mode Switch parameter indicates Park
Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing.
- If the counter increments
  Replace the B26 Crankshaft Position Sensor.
- If the counter does not increment
Verify the crank relay clicks and the engine begins cranking with the ignition in the Crank position.
- If the KR27 starter relay does not click
  Refer to Circuit/System Testing .
- If the KR27 starter relay clicks
All OK.